Magnet-frame for electric ignition-machines.



G. HONOLD. MAGNET FRAME POE ELECTRIC IGNITION MACHINES.

I APPLICATION FILED MAY 17, 1910.

1,020, 143, Patented Mar. 12, 1912.

3 SHEETS-SHEET 1.

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I {M h o M as A A A} m G-i- HONOLD. MAGNET FRAME FOE ELECTRIC IGNITION MACHINES. APPLICATION FILED MAY 17I 1910.

1,020,143, Patented Mar. 12, 1912,

'3 SHEETS-SHEET 2.

077,60 INJENTUR G.HONOLD. MAGNET FRAME FOR ELECTRIC IGNITION MACHINES.

v APPLICATION FILED MAY 17, 1910. 1,020,143.

3 SHEETS-SHEET 3.

N N m m Patented Mar. 12, 1912.

m N Ni N W N NN WRN B Q imrrnn srairns k GOTTLOB HONOLD, F STUTTGART, GERMANY, ASSIGNOR T0 FIRM OF' ROBERT BOSCH, F STUTTGART, GERMANY.

Specification of Letters Patent.

Patented Mar. 12,1912.

Application filed May 1?, 1910. Serial No. 561,892.

To all whom it may concern:

Be it known that I, GOTTLOB HoNoLD, en-

' gineer, a subject of the German Emperor,

residing at 11 -13 Hoppenlaustrasse, Stuttgart, Germany, have invented certain new and useful Improvements in Magnet-Frames for Electric Ignition-Machines; and I do hereby declare the'following to be a' full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in magnet frames for electric ignition machines and particularly electric ignition machines of the kind employed for igniting the explosive mixtures of explosion motors. In ignition machines of this kind the greatest attainable efiiciency must be combined with the greatest economy in space, and at the same time the construction must be so chosen that the energetic vibrations to which such machines are exposed in their operation shall not effect any loosening up of the constituent parts.

Accordingly, the invention contemplates the realization of these requirements, first, by such a construction of the magnet frame that its poles are formed by a special configuration of the steel magnet itself, and, secondly, by providing the steel magnet with surfaces which, in a simplermanner, make possible an extraordinarily firm connection with the armature housing.

In the drawing, the magnet frame, constituting the subject matter of the invention, is illustrated in several modifications.

Figure 1 represents an end view, partially in section, the section being taken on a plane indicated by the line 11 on Fig. 2. Fig.2 represents a section on a plane indicated by the line 22 of Fig. 1. Fig. 3 represents a side elevation. Figs. 4 and 5 are views similar to Fig. 1 but illustrate a modified manner of connecting the magnet. represents an end view of another modification. Fig. 7 represents a section on a plane indicated by the line 7-7 of Fig. 6. Fig. 8 represents a section taken on a plane indlcated by the line 88 of Fig. 6. Fig. 9 represents a section similar to Fig. 2, but shows the magnet frame as adapted for three instead of two magnets.

Similar letters of reference indicate similar parts throughout the several views,

Fig. 6

The steel magnet a is made, in the usual way, by bending steel bars in the custbmary horseshoe form. The shanks of the horseshoe, however, are not straight as is customary, but are bent out at their free ends, so that without diminishing their cross section they may conform to the outer surface of the armature, after the manner of pole shoes.

The ends bb of the pole shoe portions are machined off evenly, preferably in such manner that the surfaces so obtained are radial to the axis of the armature. Similar surfaces are provided at cc for the inner parallel sides of the shanks.

The armature housing, which is preferably made of non-magnetic metal and may conveniently be produced by casting, consists of the base d, the cover (Z and the two ends ee. At least one of the two ends, ee, is made in the form of a ring, with an opening sufiiciently large to permit the introduction of the armature, while the other, as shown for instance in Figs. 1 and. 2, is closed except for an aperture through which the armature shaft may pass. At b-b and cc the armature housing is likewise provided with machined fitting surfaces which correspond to the fitting surfaces of the steel magnet. In the exemplification of the invention shown in Figs. 1 and 3 the two end plates ee' are further provided with lugs hh which project in the direction of the end plates, and at both ends of the foundation plate a? there are provided two lugs ii which securely hold the armature housing %nd the magnets together at the fitting sur- "aces.

. The steel magnets are introduced from above radially into the armature housing, whereby the four fitting surfaces come into .close contact. Thereupon the lugs'izrk are upset about the end surfaces of the magnets on both sides thereof. This upsettingoperation, according to the character of the material from which the armature housing is made, can be efiected either cold .or after suitable heating.

Instead of providing the armature housing with outwardly projecting lugs and then upsetting these lugs exteriorly of the magnets, the magnets may be provided, as shown in Figs. 6 to 8, with recesses is at the portion corresponding to the pole shoes. In such case, the armature housing, at corresponding locations would have inwardly projecting lugs Z Z which, by an upsetting operation, can be forced into these recesses. C0nnecting the parts by an upsetting operation is only available in these two instances, provided one or two magnet bars are employed. If the number of magnet bars is increased, they should be divided up individually or in pairs, and between the individual groups nection by an upsetting operation, the magnets could be connected up in the manner shown in Figs. 4 and 5, by means of screws 'nn or n n,. Inasmuch as the configuration of the steel magnets incident to the construction avoids any diminution in the cross section andl further, inasmuch as there is no resistance to be overcome for the magnetic flux between the main body portion of the steel magnets and the pole shoes, the arrangement described realizes the highest attainable strength of field and likewise permits an extraordinarily intimate connection between the magnets and the armature housing.

l/Vhat I claim is 1. In an electric ignition machine for in ternal combustion motors, the combination with an armature housing having two fitting surfaces radial to the armature axis and two fitting surfaces parallel to the shanks of the magnet, of a steel magnet comprising shanks and outwardly bent pole shoes of cross section equal to that of the shanks, said shanks being provided with fitting surfaces-corresponding to.the said fitting surfaces of the armature housing; substantially as described.

2. In an. electric ignition machine for internal combustion motors, the combination with an armature housing provided with two fitting surfaces radial to the armatureaxis and two fitting surfaces parallel to the shanks of the magnet, of a permanent magnetcomprising shanks and outwardly bent pole shoes of cross section equal to that of the shanks, said shanks being provided with corresponding fitting surfaces, and means for connecting up the magnet in the working assemblage; substantially as described.

3. In an electric ignition machine for internal combustion motors, the combination with an armature housing provided with radial fitting surfaces and parallel fitting surfaces, of a permanent magnet, comprising shanks and outwardly bent pole shoes of cross section equal to that of the shanks, the shanks being provided with corresponding fitting surfaces, and the armature housing being provided with lugs adapted, after the magnet has been inserted in its working position, to be upset about the edges thereof; substantially as described.

4. In an electric ignition machine for internal combustion motors, the combination with an armature housing having radial fitting surfaces and parallel fitting surfaces, of a permanent magnet consisting of a plurality of steel bars, comprising shanks and outwardly bent pole shoes of cross section equal te tlfat of the shanks, said shanks being provided with corresponding fitting surfaces, and means for securing the magnet in the working assemblage; described.

5. In an electric ignition machine for internal combustion motors, the combination with an armature housing provided with radial fitting surfaces and parallel fitting surfaces, of a permanent magnetcomprissubstantially as ing morethan two bars each having shanks and-outwardly bent pole shoes of cross section equal to that of the shanks and having corresponding fitting surfaces, the armature housing being provided with end plates having lugs adapted to be upset about the edges of the pole shoes, and the armature housing being likewise provided with a rib on its exterior surface, said rib having lugs which are adapted to be upset upon the edges of the adjacent pole shoes; substantially as described.

In testimony whereof I have afixed my signature, in presence of two witnesses.

GOTTLOB non'oiin 

